Optical imaging lens

ABSTRACT

The present invention provides an optical imaging lens. The optical imaging lens comprises eight lens elements positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the optical imaging lens may enlarge aperture stop and image height and increase resolution.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.202010824313.4 titled “Optical Imaging Lens,” filed Aug. 17, 2020, withthe State Intellectual Property Office of the People's Republic of China(SIPO).

TECHNICAL FIELD

The present disclosure relates to optical imaging lenses, andparticularly, optical imaging lenses of mobile electronic devices.

BACKGROUND

As the specifications of mobile electronical devices, such as cellphones, digital cameras, tablet computers, personal digital assistants(PDA), etc. rapidly evolve, various types of key components, such asoptical imaging lenses, are developed. Desirable objectives fordesigning an optical imaging lens may not be limited to large apertureand short system length, but may also include great pixels and betterresolution. Great pixels implies great image height which may be carriedout with a great image sensor receiving imaging light. Large aperturemay allow optical imaging lenses receiving more imaging rays; however,to design such optical imaging lenses is more difficult. Whenconsidering both large aperture and great pixels, it is even moredifficult to design optical imaging lenses. Accordingly, designing anoptical imaging lens with multiple lens elements within a limited systemlength presenting great resolution and enlarged aperture and imageheight may be goals of research and design in the industry.

SUMMARY

The present disclosure provides for optical imaging lenses enlargingaperture stop and image height and increasing resolution in view ofachieving good imaging quality.

In an example embodiment, an optical imaging lens may comprise eightlens elements, hereinafter referred to as first, second, third, fourth,fifth, sixth, seventh and eighth lens element and positionedsequentially from an object side to an image side along an optical axis.Each of the first, second, third, fourth, fifth, sixth, seventh andeighth lens element may also have an object-side surface facing towardthe object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through.

In the specification, parameters used here are defined as follows: athickness of the first lens element along the optical axis isrepresented by T1, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e. an air gap between the first and second lenselements along the optical axis, is represented by G12, a thickness ofthe second lens element along the optical axis is represented by T2, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis,i.e. an air gap between the second and third lens elements along theoptical axis, is represented by G23, a thickness of the third lenselement along the optical axis is represented by T3, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, i.e. an air gapbetween the third and fourth lens elements along the optical axis, isrepresented by G34, a thickness of the fourth lens element along theoptical axis is represented by T4, a distance from the image-sidesurface of the fourth lens element to the object-side surface of thefifth lens element along the optical axis, i.e. an air gap between thefourth and fifth lens elements along the optical axis, is represented byG45, a thickness of the fifth lens element along the optical axis isrepresented by T5, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, i.e. an air gap between the fifth and sixth lenselements along the optical axis, is represented by G56, a thickness ofthe sixth lens element along the optical axis is represented by T6, adistance from the image-side surface of the sixth lens element to theobject-side surface of the seventh lens element along the optical axis,i.e. an air gap between the sixth and seventh lens elements along theoptical axis, is represented by G67, a thickness of the seventh lenselement along the optical axis is represented by T7, an air gap betweenthe seventh and eighth lens elements along the optical axis, isrepresented by G78, a thickness of the eighth lens element along theoptical axis is represented by T8, a distance from the image-sidesurface of the eighth lens element to the object-side surface of thefiltering unit along the optical axis is represented by G8F, a thicknessof the filtering unit along the optical axis is represented by TTF, adistance from the image-side surface of the filtering unit to the imageplane along the optical axis is represented by GFP, a focal length ofthe first lens element is represented by f1, a focal length of thesecond lens element is represented by f2, a focal length of the thirdlens element is represented by f3, a focal length of the fourth lenselement is represented by f4, a focal length of the fifth lens elementis represented by f5, a focal length of the sixth lens element isrepresented by f6, a focal length of the seventh lens element isrepresented by f7, a focal length of the eighth lens element isrepresented by f8, a refractive index of the first lens element isrepresented by n1, a refractive index of the second lens element isrepresented by n2, a refractive index of the third lens element isrepresented by n3, a refractive index of the fourth lens element isrepresented by n4, a refractive index of the fifth lens element isrepresented by n5, a refractive index of the sixth lens element isrepresented by n6, a refractive index of the seventh lens element isrepresented by n7, a refractive index of the eighth lens element isrepresented by n8, an abbe number of the first lens element isrepresented by V1, an abbe number of the second lens element isrepresented by V2, an abbe number of the third lens element isrepresented by V3, an abbe number of the fourth lens element isrepresented by V4, an abbe number of the fifth lens element isrepresented by V5, an abbe number of the sixth lens element isrepresented by V6, an abbe number of the seventh lens element isrepresented by V7, an abbe number of the eighth lens element isrepresented by V8, an effective focal length of the optical imaging lensis represented by EFL, a distance from the object-side surface of thefirst lens element to the image-side surface of the eighth lens elementalong the optical axis is represented by TL, a distance from theobject-side surface of the first lens element to the image plane alongthe optical axis, i.e. a system length, is represented by TTL, adistance from the object-side surface of the first lens element to theobject-side surface of the fifth lens element along the optical axis isrepresented by D11t51, a distance from the image-side surface of thefirst lens element to the object-side surface of the fifth lens elementalong the optical axis is represented by D12t51, a sum of thethicknesses of all eight lens elements from the first lens element tothe eighth lens element along the optical axis is represented by ALT, asum of seven air gaps from the first lens element to the eighth lenselement along the optical axis, i.e. a sum of G12, G23, G34, G45, G56,G67 and G78, is represented by AAG, a distance from the image-sidesurface of the eighth lens element to the image plane along the opticalaxis is represented by BFL, a half field of view of the optical imaginglens is represented by HFOV, an image height of the optical imaging lensis represented by ImgH, and a f-number of the optical imaging lens isrepresented by Fno.

In an aspect of the present disclosure, in the optical imaging lens, thefourth lens element has negative refracting power, an optical axisregion of the object-side surface of the fifth lens element is concave,the sixth lens element has negative refracting power and a peripheryregion of the image-side surface of the sixth lens element is convex,and an optical axis region of the image-side surface of the eighth lenselement is concave. Lens elements included by the optical imaging lensare only the eight lens elements described above, and the opticalimaging lens satisfies the inequality:

V1+V2+V3≤115.000  Inequality (1).

In another aspect of the present disclosure, in the optical imaginglens, the second lens element has negative refracting power, the fourthlens element has negative refracting power, an optical axis region ofthe object-side surface of the fifth lens element is concave, the sixthlens element has negative refracting power, and an optical axis regionof the image-side surface of the eighth lens element is concave. Lenselements included by the optical imaging lens are only the eight lenselements described above, and the optical imaging lens satisfies theinequality:

V1+V3≤100.000  Inequality (2).

In another aspect of the present disclosure, in the optical imaginglens, the second lens element has negative refracting power, the fourthlens element has negative refracting power, an optical axis region ofthe object-side surface of the fifth lens element is concave, the sixthlens element has negative refracting power, the seventh lens element haspositive refracting power, and an optical axis region of the image-sidesurface of the eighth lens element is concave. Lens elements included bythe optical imaging lens are only the eight lens elements describedabove, and the optical imaging lens satisfies the inequality:

V3+V7≤100.000  Inequality (3).

In another example embodiment, other inequality(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example:

V3+V4+V5+V6+V7+V8≤235.000  Inequality (4);

3.300≤(EFL/Fno+ImgH)/D11t51  Inequality (5);

D11t51/(T5+G56)≤3.600  Inequality (6);

D12t51/(T6+G56)≤1.800  Inequality (7);

D12t51/T8≤3.600  Inequality (8);

AAG/(T8+G78)≤2.000  Inequality (9);

V3+V8≤95.000  Inequality (10);

8.750≤(EFL/Fno+ImgH)/BFL  Inequality (11);

(T6+G67+T7)/T1≤1.800  Inequality (12);

ALT/AAG≤2.200  Inequality (13);

(T2+G34+T6+G67+T7)/(T5+G56)≤2.600  Inequality (14);

(T2+G12+T6+G67+T7)/(T4+T5)≤2.000  Inequality (15);

V3+V5≤100.000  Inequality (16);

(T1+T3+T6+T7)/(G12+G78)≤9.000  Inequality (17);

(T3+T4+T6+T7)/(G45+G56)≤4.400  Inequality (18);

(G23+T3+G34+T7)/G78≤8.000  Inequality (19); and/or

TTL/(G56+G78)≤10.000  Inequality (20).

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated in example embodiments if no inconsistency occurs.

The optical imaging lens in example embodiments may enlarge aperturestop and image height and increase resolution in view of achieving goodimaging quality.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a cross-sectional view showing the relation between theshape of a portion and the position where a collimated ray meets theoptical axis;

FIG. 3 depicts a cross-sectional view showing a first example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 4 depicts a cross-sectional view showing a second example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 5 depicts a cross-sectional view showing a third example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a second embodiment of the opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a third embodiment of the opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a fourth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a sixth embodiment of the opticalimaging lens according the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens of a sixth embodiment of the present disclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of a seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of aseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of an eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of aneighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a table for the values of V1+V2+V3, V1+V3, V3+V7,V3+V4+V5+V6+V7+V8, (EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56),D12t51/(T6+G56), D12t51/T8, AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL,(T6+G67+T7)/T1, ALT/AAG, (T2+G34+T6+G67+T7)/(T5+G56),(T2+G12+T6+G67+T7)/(T4+T5), V3+V5, (T1+T3+T6+T7)/(G12+G78),(T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78 and TTL/(G56+G78) of alleight example embodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons of ordinary skill in the arthaving the benefit of the present disclosure will understand othervariations for implementing embodiments within the scope of the presentdisclosure, including those specific examples described herein. Thedrawings are not limited to specific scale and similar reference numbersare used for representing similar elements. As used in the disclosuresand the appended claims, the terms “example embodiment,” “exemplaryembodiment,” and “present embodiment” do not necessarily refer to asingle embodiment, although it may, and various example embodiments maybe readily combined and interchanged, without departing from the scopeor spirit of the present disclosure. Furthermore, the terminology asused herein is for the purpose of describing example embodiments onlyand is not intended to be a limitation of the disclosure. In thisrespect, as used herein, the term “in” may include “in” and “on”, andthe terms “a”, “an” and “the” may include singular and pluralreferences. Furthermore, as used herein, the term “by” may also mean“from”, depending on the context. Furthermore, as used herein, the term“if” may also mean “when” or “upon”, depending on the context.Furthermore, as used herein, the words “and/or” may refer to andencompass any and all possible combinations of one or more of theassociated listed items.

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex- (concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

In the present disclosure, examples of an optical imaging lens areprovided. Example embodiments of an optical imaging lens may comprise afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element. Each of the lenselements may comprise an object-side surface facing toward an objectside allowing imaging rays to pass through and an image-side surfacefacing toward an image side allowing the imaging rays to pass through.These lens elements may be arranged sequentially from the object side tothe image side along an optical axis, and example embodiments of lenselements included by the optical imaging lens may be only the eight lenselements described above. Through controlling shape of the surfaces andrange of the parameters, the optical imaging lens in example embodimentsmay enlarge aperture stop and image height and increase resolution.

In some embodiments, the lens elements are designed with convex/concavesurface shape and refracting power of lens elements in light of theoptical characteristics and system length.

For example, when an optical imaging lens according to an embodiment ofthe invention presents negative refracting power of the fourth lenselement, a concave optical axis region of the object-side surface of thefifth lens element, negative refracting power of the sixth lens element,a concave optical axis region of the image-side surface of the eighthlens element along with one of the groups: (1) a convex periphery regionof the image-side surface of the sixth lens element and satisfyingV1+V2+V3≤115.000, preferably 87.000 c V1+V2+V3≤115.000; (2) negativerefracting power of the second lens element and satisfyingV1+V3≤100.000, preferably 68.000≤V1+V3≤100.000; (3) negative refractingpower of the second lens element, positive refracting power of theseventh lens element and satisfying V3+V7≤100.000, preferably68.000≤V3+V7≤100.000, it may be beneficial to increase resolution andenlarge aperture stop and image height. When an optical imaging lensaccording to an embodiment of the invention presents a concave peripheryregion of the image-side surface of the first lens element, negativerefracting power of the second lens element, a concave periphery regionof the image-side surface of the third lens element, negative refractingpower of the fourth lens element, a concave optical axis region of theobject-side surface of the fifth lens element, a convex optical axisregion of the image-side surface of the seventh lens element andsatisfying V2+V3+V4+V5+V6≤175.000, preferably125.000≤V2+V3+V4+V5+V6≤175.000, it may be beneficial to increaseresolution and enlarge aperture stop and image height at the same time.When an optical imaging lens according to an embodiment of the inventionpresents a concave periphery region of the image-side surface of thefirst lens element, a concave periphery region of the image-side surfaceof the third lens element, negative refracting power of the fourth lenselement, a concave optical axis region of the object-side surface of thefifth lens element, a convex optical axis region of the image-sidesurface of the seventh lens element and satisfyingV1+V2+V3+V4+V5+V6≤220.000, preferably 144.000≤V1+V2+V3+V4+V5+V6≤220.000,it may be beneficial to increase resolution and enlarge aperture stopand image height at the same time. When an optical imaging lensaccording to an embodiment of the invention presents a concave peripheryregion of the image-side surface of the first lens element, negativerefracting power of the second lens element, a concave periphery regionof the image-side surface of the third lens element, negative refractingpower of the fourth lens element, a concave optical axis region of theobject-side surface of the fifth lens element, a convex optical axisregion of the image-side surface of the seventh lens element, a concaveperiphery region of the object-side surface of the eighth lens elementand satisfying V1+V2+V3+V4+V5+V6+V7+V8≤350.000, preferably 224.000V1+V2+V3+V4+V5+V6+V7+V8≤350.000, it may be beneficial to increaseresolution and enlarge aperture stop and image height at the same time.When an optical imaging lens according to an embodiment of the inventionpresents a concave optical axis region of the image-side surface of thefirst lens element, a convex periphery region of the image-side surfaceof the fourth lens element, positive refracting power of the fifth lenselement, a concave optical axis region of the object-side surface of thefifth lens element, a convex optical axis region of the image-sidesurface of the seventh lens element and satisfyingV3+V4+V5+V6+V7+V8≤235.000, preferably 144.000≤V3+V4+V5+V6+V7+V8≤235.000,as well as either a concave periphery region of the image-side surfaceof the third lens element or negative refracting power of the sixth lenselement, it may be beneficial to increase resolution and enlargeaperture stop and image height at the same time. When an optical imaginglens according to an embodiment of the invention presents a concaveperiphery region of the image-side surface of the first lens element,negative refracting power of the second lens element, a concaveperiphery region of the image-side surface of the third lens element,negative refracting power of the fourth lens element, a concave opticalaxis region of the object-side surface of the fifth lens element,negative refracting power of the sixth lens element, a concave opticalaxis region of the image-side surface of the eighth lens element andsatisfying V3+V5≤100.000, preferably 68.000≤V3+V5≤100.000, it may bebeneficial to increase resolution and enlarge aperture stop and imageheight at the same time. When an optical imaging lens according to anembodiment of the invention presents negative refracting power of thesecond lens element, a concave optical axis region of the object-sidesurface of the fifth lens element, negative refracting power of thesixth lens element, a convex optical axis region of the image-sidesurface of the seventh lens element, a concave periphery region of theobject-side surface of the eighth lens element, a concave optical axisregion of the image-side surface of the eighth lens element andsatisfying V3+V8≤95.000, preferably 68.000≤V3+V8≤95.000, as well as aconvex periphery region of the object-side surface of the third lenselement, a concave periphery region of the image-side surface of thethird lens element, negative refracting power of the fourth lens elementor a convex optical axis region of the object-side surface of the sixthlens element, it may be beneficial to increase resolution and enlargeaperture stop and image height at the same time.

When the optical imaging lens further satisfies at least one of theinequalities listed below, the effective focal length and each parametermay be sustained proper values to avoid any excessive value which may beunfavorable to adjust aberration of the whole system and anyinsufficient value which may increase the production or assemblydifficulty:

3.300≤(EFL/Fno+ImgH)/D11t51, and preferably,3.300≤(EFL/Fno+ImgH)/D11t51≤4.300;

8.750≤(EFL/Fno+ImgH)/BFL, and preferably,8.750≤(EFL/Fno+ImgH)/BFL≤15.000.

When the optical imaging lens further satisfies at least one of theinequalities listed below, the thickness of each lens element and airgap between lens elements may be sustained proper values to avoid anyexcessive value which may be unfavorable to shorten system length andany insufficient value which may increase the production or assemblydifficulty:

D11t51/(T5+G56)≤3.600, and preferably, 1.000≤D11t51/(T5+G56)≤3.600;

D12t51/(T6+G56)≤1.800, and preferably, 0.800≤D12t51/(T6+G56)≤1.800;

D12t51/T8≤3.600, and preferably, 1.400≤D12t51/T8≤3.600;

AAG/(T8+G78)≤2.000, and preferably, 1.100≤AAG/(T8+G78)≤2.000;

(T6+G67+T7)/T1≤1.800, and preferably, 1.000≤(T6+G67+T7)/T1≤1.800;

ALT/AAG≤2.200, and preferably, 1.100≤ALT/AAG≤2.200;

(T2+G34+T6+G67+T7)/(T5+G56)≤2.600, and preferably, 1.000≤

(T2+G34+T6+G67+T7)/(T5+G56)≤2.600;

(T2+G12+T6+G67+T7)/(T4+T5)≤2.000, and preferably,0.800≤(T2+G12+T6+G67+T7)/(T4+T5)≤2.000;

(T1+T3+T6+T7)/(G12+G78)≤9.000, and preferably,1.100≤(T1+T3+T6+T7)/(G12+G78)≤9.000;

(T3+T4+T6+T7)/(G45+G56)≤4.400, and preferably,1.400≤(T3+T4+T6+T7)/(G45+G56)≤4.400;

(G23+T3+G34+T7)/G78≤8.000, and preferably,0.700≤(G23+T3+G34+T7)/G78≤8.000;

TTL/(G56+G78)≤10.000, and preferably, 3.500≤TTL/(G56+G78)≤10.000.

In light of the unpredictability in an optical system, satisfying theseinequalities listed above may result in promoting the imaging quality,shortening the system length of the optical imaging lens, lowering thef-number, increasing HFOV and/or increasing the yield in the assemblyprocess in the present disclosure.

When implementing example embodiments, more details about the convex orconcave surface or refracting power could be incorporated for onespecific lens element or broadly for a plurality of lens elements toimprove the control for the system volume, performance, resolution,and/or promote the yield. For example, in an example embodiment, eachlens element may be made from all kinds of transparent material, such asglass, plastic, resin, etc. It is noted that the details listed herecould be incorporated in example embodiments if no inconsistency occurs.

Several example embodiments and associated optical data will now beprovided for illustrating example embodiments of an optical imaging lenswith good optical characteristics, a wide field of view and/or a lowf-number. Reference is now made to FIGS. 6-9. FIG. 6 illustrates anexample cross-sectional view of an optical imaging lens 1 having eightlens elements of the optical imaging lens according to a first exampleembodiment. FIG. 7 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 1 according to an example embodiment. FIG. 8 illustrates an exampletable of optical data of each lens element of the optical imaging lens 1according to an example embodiment. FIG. 9 depicts an example table ofaspherical data of the optical imaging lens 1 according to an exampleembodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in the order from an object side A1 to an image side A2along an optical axis, an aperture stop STO, a first lens element L1, asecond lens element L2, a third lens element L3, a fourth lens elementL4, a fifth lens element L5, a sixth lens element L6, a seventh lenselement L7 and an eighth lens element L8. A filtering unit TF and animage plane IMA of an image sensor may be positioned at the image sideA2 of the optical lens 1. Each of the first, second, third, fourth,fifth, sixth, seventh and eighth lens element L1, L2, L3, L4, L5, L6,L7, L8 and the filtering unit TF may comprise an object-side surfaceL1A1/L2A1/L3A1/L4A1/L5A1/L6A1/L7A1/L8A1/TFA1 facing toward the objectside A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/L7A2/L8A2/TFA2 facing toward the imageside A2. The filtering unit TF, positioned between the eighth lenselement L8 and the image plane IMA, may selectively absorb light withspecific wavelength(s) from the light passing through optical imaginglens 1. The example embodiment of the filtering unit TF which mayselectively absorb light with specific wavelength(s) from the lightpassing through optical imaging lens 1 may be an IR cut filter (infraredcut filter). Then, IR light may be absorbed, and this may prohibit theIR light, which might not be seen by human eyes, from producing an imageon the image plane IMA.

Example embodiments of each lens element of the optical imaging lens 1,which may be constructed by glass, plastic, resin material or othertransparent material and is constructed by plastic material here forexample, will now be described with reference to the drawings.

An example embodiment of the first lens element L1 may have positiverefracting power. On the object-side surface L1A1, an optical axisregion L1A1C may be convex and a periphery region L1A1P may be convex.On the image-side surface L1A2, an optical axis region L1A2C may beconcave and a periphery region L1A2P may be concave.

An example embodiment of the second lens element L2 may have negativerefracting power. On the object-side surface L2A1, an optical axisregion L2A1C may be convex and a periphery region L2A1P may be convex.On the image-side surface L2A2, an optical axis region L2A2C may beconcave and a periphery region L2A2P may be concave.

An example embodiment of the third lens element L3 may have positiverefracting power. On the object-side surface L3A1, an optical axisregion L3A1C may be convex and a periphery region L3A1P may be convex.On the image-side surface L3A2, an optical axis region L3A2C may beconcave and a periphery region L3A2P may be concave.

An example embodiment of the fourth lens element L4 may have negativerefracting power. On the object-side surface L4A1, an optical axisregion L4A1C may be convex and a periphery region L4A1P may be concave.On the image-side surface L4A2, an optical axis region L4A2C may beconcave and a periphery region L4A2P may be convex.

An example embodiment of the fifth lens element L5 may have positiverefracting power. On the object-side surface L5A1, an optical axisregion L5A1C may be concave and a periphery region L5A1P may be concave.On the image-side surface L5A2, an optical axis region L5A2C may beconvex and a periphery region L5A2P may be convex.

An example embodiment of the sixth lens element L6 may have negativerefracting power. On the object-side surface L6A1, an optical axisregion L6A1C may be convex and a periphery region L6A1P may be concave.On the image-side surface L6A2, an optical axis region L6A2C may beconcave and a periphery region L6A2P may be convex.

An example embodiment of the seventh lens element L7 may have positiverefracting power. On the object-side surface L7A1, an optical axisregion L7A1C may be convex and a periphery region L7A1P may be concave.On the image-side surface L7A2, an optical axis region L7A2C may beconvex and a periphery region L7A2P may be convex.

An example embodiment of the eighth lens element L8 may have negativerefracting power. On the object-side surface L8A1, an optical axisregion L8A1C may be concave and a periphery region L8A1P may be concave.On the image-side surface L8A2, an optical axis region L8A2C may beconcave and a periphery region L8A2P may be convex.

In example embodiments, air gaps may exist between each pair of adjacentlens elements, as well as between the eighth lens element L8 and thefiltering unit TF, and the filtering unit TF and the image plane IMA ofthe image sensor. Please note, in other embodiments, any of theaforementioned air gaps may or may not exist. For example, profiles ofopposite surfaces of a pair of adjacent lens elements may align withand/or attach to each other, and in such situations, the air gap mightnot exist.

FIG. 8 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment. Please also refer toFIG. 38 for the values of V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8,(EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56), D12t51/(T6+G56), D12t51/T8,AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) corresponding to the present embodiment.

The totaled 16 aspherical surfaces, including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7 and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{i} \times Y^{i}}}}$

wherein, Y represents the perpendicular distance between the point ofthe aspherical surface and the optical axis; Z represents the depth ofthe aspherical surface (the perpendicular distance between the point ofthe aspherical surface at a distance Y from the optical axis and thetangent plane of the vertex on the optical axis of the asphericalsurface); R represents the radius of curvature of the surface of thelens element; K represents a conic constant; a, represents an asphericalcoefficient of i^(th) level. The values of each aspherical parameter areshown in FIG. 9.

Referring to FIG. 7(a), a longitudinal spherical aberration of theoptical imaging lens in the present embodiment is shown in coordinatesin which the horizontal axis represents longitudinal sphericalaberration and the vertical axis represents field of view, and FIG.7(b), field curvature of the optical imaging lens in the presentembodiment in the sagittal direction is shown, and FIG. 7(c), fieldcurvature in the tangential direction of the optical imaging lens in thepresent embodiment is shown in coordinates in which the horizontal axisrepresents field curvature and the vertical axis represents imageheight, and FIG. 7(d), distortion aberration of the optical imaging lensin the present embodiment is shown in coordinates in which thehorizontal axis represents percentage and the vertical axis representsimage height. The curves of different wavelengths (470 nm, 555 nm, 650nm) may be close to each other. This represents that off-axis light withrespect to these wavelengths may be focused around an image point. Fromthe vertical deviation of each curve shown therein, the offset of theoff-axis light relative to the image point may be within −0.018˜0.018mm. Therefore, the present embodiment may improve the longitudinalspherical aberration with respect to different wavelengths. For fieldcurvature in the sagittal direction, the focus variation with respect tothe three wavelengths in the whole field may fall within −18˜−20 μm, forfield curvature in the tangential direction, the focus variation withrespect to the three wavelengths in the whole field may fall within−18˜20 μm, and the variation of the distortion aberration may be within0˜16%.

According to the values of the aberrations, it is shown that the opticalimaging lens 1 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 6.150 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having eight lenselements of the optical imaging lens according to a second exampleembodiment. FIG. 11 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 2 according to the second example embodiment. FIG. 12 shows anexample table of optical data of each lens element of the opticalimaging lens 2 according to the second example embodiment. FIG. 13 showsan example table of aspherical data of the optical imaging lens 2according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8. The differences betweenthe second embodiment and the first embodiment may include the radius ofcurvature, thickness of each lens element, the value of each air gap,aspherical data and related optical parameters, such as back focallength; but the configuration of the concave/convex shape of surfaces,comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1,L7A1 and L8A1 facing to the object side A1 and the image-side surfacesL1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2 facing to the imageside A2, and positive or negative configuration of the refracting powerof each lens element may be similar to those in the first embodiment.Please refer to FIG. 12 for the optical characteristics of each lenselements in the optical imaging lens 2 of the present embodiment, andplease refer to FIG. 38 for the values of V1+V2+V3, V1+V3, V3+V7,V3+V4+V5+V6+V7+V8, (EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56),D12t51/(T6+G56), D12t51/T8, AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL,(T6+G67+T7)/T1, ALT/AAG, (T2+G34+T6+G67+T7)/(T5+G56),(T2+G12+T6+G67+T7)/(T4+T5), V3+V5, (T1+T3+T6+T7)/(G12+G78),(T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78 and TTL/(G56+G78) of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 11(a), the offsetof the off-axis light relative to the image point may be within−0.006˜0.014 mm. As the field curvature in the sagittal direction shownin FIG. 11(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.015˜0.03 mm. As the fieldcurvature in the tangential direction shown in FIG. 11(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.01˜0.04 mm. As shown in FIG. 11(d), the variation of thedistortion aberration may be within 0˜14%. Compared with the firstembodiment, the longitudinal spherical aberration and the distortionaberration of the present embodiment are smaller.

According to the values of the aberrations, it is shown that the opticalimaging lens 2 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 6.150 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having eight lenselements of the optical imaging lens according to a third exampleembodiment. FIG. 15 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 3 according to the third example embodiment. FIG. 16 shows anexample table of optical data of each lens element of the opticalimaging lens 3 according to the third example embodiment. FIG. 17 showsan example table of aspherical data of the optical imaging lens 3according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the third embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data and related opticalparameters, such as back focal length; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the objectside A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of each lens element may besimilar to those in the first embodiment. Please refer to FIG. 16 forthe optical characteristics of each lens elements in the optical imaginglens 3 of the present embodiment, and please refer to FIG. 38 for thevalues of V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8,(EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56), D12t51/(T6+G56), D12t51/T8,AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 15(a), the offsetof the off-axis light relative to the image point may be within−0.008˜0.014 mm. As the field curvature in the sagittal direction shownin FIG. 15(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.015˜0.02 mm. As the fieldcurvature in the tangential direction shown in FIG. 15(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.01˜0.03 mm. As shown in FIG. 15(d), the variation of thedistortion aberration may be within 0˜12%. Compared with the firstembodiment, the longitudinal spherical aberration, the field curvaturein the sagittal direction and the distortion aberration may be smallerin the present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 3 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 6.150 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having eight lenselements of the optical imaging lens according to a fourth exampleembodiment. FIG. 19 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 4 according to the fourth embodiment. FIG. 20 shows an exampletable of optical data of each lens element of the optical imaging lens 4according to the fourth example embodiment. FIG. 21 shows an exampletable of aspherical data of the optical imaging lens 4 according to thefourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fourth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data and related opticalparameters, such as back focal length; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the objectside A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of each lens element may besimilar to those in the first embodiment. Please refer to FIG. 20 forthe optical characteristics of each lens elements in the optical imaginglens 4 of the present embodiment, please refer to FIGURE for the valuesof V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8, (EFL/Fno+ImgH)/D11t51,D11t51/(T5+G56), D12t51/(T6+G56), D12t51/T8, AAG/(T8+G78), V3+V8,(EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 19(a), the offsetof the off-axis light relative to the image point may be within−0.008˜0.016 mm. As the field curvature in the sagittal direction shownin FIG. 19(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.015˜0.025 mm. As the fieldcurvature in the tangential direction shown in FIG. 19(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.01˜0.025 mm. As shown in FIG. 19(d), the variation of thedistortion aberration may be within 0˜8%. Compared with the firstembodiment, the longitudinal spherical aberration, the field curvaturein the tangential direction and the distortion aberration may be smallerin the present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 4 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 6.150 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having eight lenselements of the optical imaging lens according to a fifth exampleembodiment. FIG. 23 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 5 according to the fifth embodiment. FIG. 24 shows an example tableof optical data of each lens element of the optical imaging lens 5according to the fifth example embodiment. FIG. 25 shows an exampletable of aspherical data of the optical imaging lens 5 according to thefifth example embodiment.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fifth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the negative refracting power of thethird lens element L3; but the configuration of the concave/convex shapeof surfaces, comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1,L5A1, L6A1, L7A1 and L8A1 facing to the object side A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2facing to the image side A2, and positive or negative configuration ofthe refracting power of each lens element other than the third lenselement L3 may be similar to those in the first embodiment. Please referto FIG. 24 for the optical characteristics of each lens elements in theoptical imaging lens 5 of the present embodiment, please refer to FIG.38 for the values of V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8,(EFL/Fno+ImgH)/D11t51, D11 t51/(T5+G56), D12t51/(T6+G56), D12t51/T8,AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 23(a), the offsetof the off-axis light relative to the image point may be within−0.08˜0.012 mm. As the field curvature in the sagittal direction shownin FIG. 23(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.01˜0.025 mm. As the fieldcurvature in the tangential direction shown in FIG. 23(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.01˜0.03 mm. As shown in FIG. 23(d), the variation of thedistortion aberration may be within 0˜9%. Compared with the firstembodiment, the longitudinal spherical aberration, the field curvaturein the both sagittal and tangential directions and the distortionaberration may be smaller in the present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 5 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 6.150 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having eight lenselements of the optical imaging lens according to a sixth exampleembodiment. FIG. 27 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 6 according to the sixth embodiment. FIG. 28 shows an example tableof optical data of each lens element of the optical imaging lens 6according to the sixth example embodiment. FIG. 29 shows an exampletable of aspherical data of the optical imaging lens 6 according to thesixth example embodiment.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the sixth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data and related opticalparameters, such as back focal length; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the objectside A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of each lens element except thethird lens element L3 may be similar to those in the first embodiment.Please refer to FIG. 28 for the optical characteristics of each lenselements in the optical imaging lens 6 of the present embodiment, pleaserefer to FIG. 38 for the values of V1+V2+V3, V1+V3, V3+V7,V3+V4+V5+V6+V7+V8, (EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56),D12t51/(T6+G56), D12t51/T8, AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL,(T6+G67+T7)/T1, ALT/AAG, (T2+G34+T6+G67+T7)/(T5+G56),(T2+G12+T6+G67+T7)/(T4+T5), V3+V5, (T1+T3+T6+T7)/(G12+G78),(T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78 and TTL/(G56+G78) of thepresent embodiment.

As the longitudinal spherical aberration shown in FIG. 27(a), the offsetof the off-axis light relative to the image point may be within−0.018˜0.012 mm. As the field curvature in the sagittal direction shownin FIG. 27(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.02˜0.03 mm. As the field curvaturein the tangential direction shown in FIG. 27(c), the focus variationwith regard to the three wavelengths in the whole field may fall within−0.02˜0.06 mm. As shown in FIG. 27(d), the variation of the distortionaberration may be within −2˜3.5%. Compared with the first embodiment,the longitudinal spherical aberration and the distortion aberration maybe smaller in the present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 6 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 5.350 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having eight lenselements of the optical imaging lens according to a seventh exampleembodiment. FIG. 31 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 7 according to the seventh embodiment. FIG. 32 shows an exampletable of optical data of each lens element of the optical imaging lens 7according to the seventh example embodiment. FIG. 33 shows an exampletable of aspherical data of the optical imaging lens 7 according to theseventh example embodiment.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the seventh embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the configuration of the concave/convexshape of the object-side surface L3A1; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the object side A1and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 andL8A2 facing to the image side A2, and positive or negative configurationof the refracting power of each lens element may be similar to those inthe first embodiment. Here and in the embodiments hereinafter, forclearly showing the drawings of the present embodiment, only the surfaceshapes which are different from that in the first embodiment may belabeled. Specifically, a periphery region L3A1P of the object-sidesurface L3A1 of the third lens element L3 may be concave. Please referto FIG. 32 for the optical characteristics of each lens elements in theoptical imaging lens 7 of the present embodiment, please refer to FIG.38 for the values of V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8,(EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56), D12t51/(T6+G56), D12t51/T8,AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 31(a), the offsetof the off-axis light relative to the image point may be within−0.01˜0.014 mm. As the field curvature in the sagittal direction shownin FIG. 31(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.02˜0.02 mm. As the field curvaturein the tangential direction shown in FIG. 31(c), the focus variationwith regard to the three wavelengths in the whole field may fall within−0.01˜0.06 mm. As shown in FIG. 31(d), the variation of the distortionaberration may be within −6˜4%. Compared with the first embodiment, thelongitudinal spherical aberration and the distortion aberration may besmaller in the present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 7 of the present embodiment, with Fno as small as 1.700 andthe image height as great as 5.029 mm, may be capable of providing goodimaging quality.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having eight lenselements of the optical imaging lens according to an eighth exampleembodiment. FIG. 35 shows example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 8 according to the eighth embodiment. FIG. 36 shows an exampletable of optical data of each lens element of the optical imaging lens 8according to the eighth example embodiment. FIG. 37 shows an exampletable of aspherical data of the optical imaging lens 8 according to theeighth example embodiment.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the eighth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the concave/convex shapeof the object-side surface L8A1, and the negative refracting power ofthe fifth lens element L5; but the configuration of the concave/convexshape of surfaces comprising the object-side surfaces L1A1, L2A1, L3A1,L4A1, L5A1, L6A1 and L7A1 facing to the object side A1 and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2facing to the image side A2, and positive or negative configuration ofthe refracting power of each lens element other than the fifth lenselement L5 may be similar to those in the first embodiment.Specifically, a periphery region L8A1P of the object-side surface L8A1of the eighth lens element L8 may be convex. Please refer to FIG. 36 forthe optical characteristics of each lens elements in the optical imaginglens 8 of the present embodiment, and please refer to FIG. 38 for thevalues of V1+V2+V3, V1+V3, V3+V7, V3+V4+V5+V6+V7+V8,(EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56), D12t51/(T6+G56), D12t51/T8,AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL, (T6+G67+T7)/T1, ALT/AAG,(T2+G34+T6+G67+T7)/(T5+G56), (T2+G12+T6+G67+T7)/(T4+T5), V3+V5,(T1+T3+T6+T7)/(G12+G78), (T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78and TTL/(G56+G78) of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 35(a), the offsetof the off-axis light relative to the image point may be within−0.035˜0.015 mm. As the field curvature in the sagittal direction shownin FIG. 35(b), the focus variation with regard to the three wavelengthsin the whole field may fall within −0.04˜−0.03 mm. As the fieldcurvature in the tangential direction shown in FIG. 35(c), the focusvariation with regard to the three wavelengths in the whole field mayfall within −0.09˜0.03 mm. As shown in FIG. 35(d), the variation of thedistortion aberration may be within −6˜2%. Compared with the firstembodiment, the distortion aberration is smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 8 of the present embodiment, with Fno as small as 1.800 andthe image height as great as 5.463 mm, may be capable of providing goodimaging quality.

Please refer to FIG. 38 for the values of V1+V2+V3, V1+V3, V3+V7,V3+V4+V5+V6+V7+V8, (EFL/Fno+ImgH)/D11t51, D11t51/(T5+G56),D12t51/(T6+G56), D12t51/T8, AAG/(T8+G78), V3+V8, (EFL/Fno+ImgH)/BFL,(T6+G67+T7)/T1, ALT/AAG, (T2+G34+T6+G67+T7)/(T5+G56),(T2+G12+T6+G67+T7)/(T4+T5), V3+V5, (T1+T3+T6+T7)/(G12+G78),(T3+T4+T6+T7)/(G45+G56), (G23+T3+G34+T7)/G78 and TTL/(G56+G78) of alleight embodiments, and the optical imaging lens of the presentdisclosure may satisfy at least one of Inequalities (1)˜(20). Further,any range of which the upper and lower limits defined by the valuesdisclosed in all of the embodiments herein may be implemented in thepresent embodiments.

According to above illustration, the longitudinal spherical aberration,field curvature in both the sagittal direction and tangential directionand distortion aberration in all embodiments may meet the userrequirement of a related product in the market. The off-axis light withregard to three different wavelengths (470 nm, 555 nm, 650 nm) may befocused around an image point and the offset of the off-axis lightrelative to the image point may be well controlled with suppression forthe longitudinal spherical aberration, field curvature both in thesagittal direction and tangential direction and distortion aberration.The curves of different wavelengths may be close to each other, and thisrepresents that the focusing for light having different wavelengths maybe good to suppress chromatic dispersion. In summary, lens elements aredesigned and matched for achieving good imaging quality.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof example embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages. Further, all of the numerical ranges including the maximumand minimum values and the values therebetween which are obtained fromthe combining proportion relation of the optical parameters disclosed ineach embodiment of the present disclosure are implementable.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the fourthlens element has negative refracting power; an optical axis region ofthe object-side surface of the fifth lens element is concave; the sixthlens element has negative refracting power and a periphery region of theimage-side surface of the sixth lens element is convex; and an opticalaxis region of the image-side surface of the eighth lens element isconcave; lens elements included by the optical imaging lens are only theeight lens elements described above; and an abbe number of the firstlens element is represented by V1, an abbe number of the second lenselement is represented by V2, an abbe number of the third lens elementis represented by V3, and the optical imaging lens satisfies theinequality:V1+V2+V3≤115.000.
 2. The optical imaging lens according to claim 1,wherein a an abbe number of the fourth lens element is represented byV4, an abbe number of the fifth lens element is represented by V5, anabbe number of the sixth lens element is represented by V6, an abbenumber of the seventh lens element is represented by V7, an abbe numberof the eighth lens element is represented by V8, and V3, V4, V5, V6, V7and V8 satisfy the inequality:V3+V4+V5+V6+V7+V8≤235.000.
 3. The optical imaging lens according toclaim 1, wherein an effective focal length of the optical imaging lensis represented by EFL, a f-number of the optical imaging lens isrepresented by Fno, an image height of the optical imaging lens isrepresented by ImgH, a distance from the object-side surface of thefirst lens element to the object-side surface of the fifth lens elementalong the optical axis is represented by D11t51, and EFL, Fno, ImgH andD11t51 satisfy the inequality:3.300≤(EFL/Fno+ImgH)/D11t51.
 4. The optical imaging lens according toclaim 1, wherein a distance from the object-side surface of the firstlens element to the object-side surface of the fifth lens element alongthe optical axis is represented by D11t51, a thickness of the fifth lenselement along the optical axis is represented by T5, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis is represented by G56,and D11t51, T5 and G56 satisfy the inequality:D11t51/(T5+G56)≤3.600.
 5. The optical imaging lens according to claim 1,wherein a distance from the image-side surface of the first lens elementto the object-side surface of the fifth lens element along the opticalaxis is represented by D12t51, a thickness of the sixth lens elementalong the optical axis is represented by T6, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis is represented by G56,and D11t51, T6 and G56 satisfy the inequality:D12t51/(T6+G56)≤1.800.
 6. The optical imaging lens according to claim 1,wherein a distance from the image-side surface of the first lens elementto the object-side surface of the fifth lens element along the opticalaxis is represented by D12t51, a thickness of the eighth lens elementalong the optical axis is represented by T8, and D12t51 and T8 satisfythe inequality:D12t51/T8≤3.600.
 7. The optical imaging lens according to claim 1,wherein a thickness of the eighth lens element along the optical axis isrepresented by T8, a sum of seven air gaps from the first lens elementto the eighth lens element along the optical axis is represented by AAG,a distance from the image-side surface of the seventh lens element tothe object-side surface of the eighth lens element along the opticalaxis is represented by G78, and AAG, T8 and G78 satisfy the inequality:AAG/(T8+G78)≤2.000.
 8. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the secondlens element has negative refracting power; the fourth lens element hasnegative refracting power; an optical axis region of the object-sidesurface of the fifth lens element is concave; the sixth lens element hasnegative refracting power; and an optical axis region of the image-sidesurface of the eighth lens element is concave; lens elements included bythe optical imaging lens are only lens elements included by the opticalimaging lens are only the eight lens elements described above; and anabbe number of the first lens element is represented by V1, an abbenumber of the third lens element is represented by V3, and the opticalimaging lens satisfies the inequalities:V1+V3≤100.000.
 9. The optical imaging lens according to claim 8, whereinan abbe number of the eighth lens element is represented by V8, and V3and V8 satisfy the inequality:V3+V8≤95.000.
 10. The optical imaging lens according to claim 8, whereinan effective focal length of the optical imaging lens is represented byEFL, a f-number of the optical imaging lens is represented by Fno, animage height of the optical imaging lens is represented by ImgH, adistance from the image-side surface of the eighth lens element to animage plane along the optical axis is represented by BFL, and EFL, Fno,ImgH and BFL satisfy the inequality:8.750≤(EFL/Fno+ImgH)/BFL.
 11. The optical imaging lens according toclaim 8, wherein a thickness of the sixth lens element along the opticalaxis is represented by T6, a distance from the image-side surface of thesixth lens element to the object-side surface of the seventh lenselement along the optical axis is represented by G67, a thickness of theseventh lens element along the optical axis is represented by T7, athickness of the first lens element along the optical axis isrepresented by T1, and T6, G67, T7 and T1 satisfy the inequality:(T6+G67+T7)/T1≤1.800.
 12. The optical imaging lens according to claim 8,wherein a sum of the thicknesses of all eight lens elements along theoptical axis is represented by ALT, a sum of seven air gaps from thefirst lens element to the eighth lens element along the optical axis isrepresented by AAG, and ALT and AAG satisfy the inequality:ALT/AAG≤2.200.
 13. The optical imaging lens according to claim 8,wherein a thickness of the second lens element along the optical axis isrepresented by T2, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis is represented by G34, a thickness of the sixth lenselement along the optical axis is represented by T6, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis is represented byG67, a thickness of the seventh lens element along the optical axis isrepresented by T7, a thickness of the fifth lens element along theoptical axis is represented by T5, a distance from the image-sidesurface of the fifth lens element to the object-side surface of thesixth lens element along the optical axis is represented by G56, and T2,G34, T6, G67, T7, T5 and G56 satisfy the inequality:(T2+G34+T6+G67+T7)/(T5+G56)≤2.600.
 14. The optical imaging lensaccording to claim 8, wherein a thickness of the second lens elementalong the optical axis is represented by T2, a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis is represented by G12,a thickness of the sixth lens element along the optical axis isrepresented by T6, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis is represented by G67, a thickness of the seventhlens element along the optical axis is represented by T7, a thickness ofthe fourth lens element along the optical axis is represented by T4, athickness of the fifth lens element along the optical axis isrepresented by T5, and T2, G12, T6, G67, T7, T4 and T5 satisfy theinequality:(T2+G12+T6+G67+T7)/(T4+T5)≤2.000.
 15. An optical imaging lens,comprising a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, a sixth lenselement, a seventh lens element and an eighth lens element sequentiallyfrom an object side to an image side along an optical axis, each of thefirst, second, third, fourth, fifth, sixth, seventh and eighth lenselement having an object-side surface facing toward the object side andallowing imaging rays to pass through and an image-side surface facingtoward the image side and allowing the imaging rays to pass through,wherein: the second lens element has negative refracting power; thefourth lens element has negative refracting power; an optical axisregion of the object-side surface of the fifth lens element is concave;the sixth lens element has negative refracting power; the seventh lenselement has positive refracting power; and an optical axis region of theimage-side surface of the eighth lens element is concave; lens elementsincluded by the optical imaging lens are only the eight lens elementsdescribed above; and an abbe number of the third lens element isrepresented by V3, an abbe number of the seventh lens element isrepresented by V7, and the optical imaging lens satisfies theinequalities:V3+V7≤100.000.
 16. The optical imaging lens according to claim 15,wherein an abbe number of the fifth lens element is represented by V5,and V3 and V5 satisfy the inequality:V3+V5≤100.000.
 17. The optical imaging lens according to claim 15,wherein a thickness of the first lens element along the optical axis isrepresented by T1, a thickness of the third lens element along theoptical axis is represented by T3, a thickness of the sixth lens elementalong the optical axis is represented by T6, a thickness of the seventhlens element along the optical axis is represented by T7, a distancefrom the image-side surface of the first lens element to the object-sidesurface of the second lens element along the optical axis is representedby G12, a distance from the image-side surface of the seventh lenselement to the object-side surface of the eighth lens element along theoptical axis is represented by G78, and T1, T3, T6, T7, G12 and G78satisfy the inequality:(T1+T3+T6+T7)/(G12+G78)≤9.000.
 18. The optical imaging lens according toclaim 15, wherein a thickness of the third lens element along theoptical axis is represented by T3, a thickness of the fourth lenselement along the optical axis is represented by T4, a thickness of thesixth lens element along the optical axis is represented by T6, athickness of the seventh lens element along the optical axis isrepresented by T7, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis is represented by G45, a distance from the image-sidesurface of the fifth lens element to the object-side surface of thesixth lens element along the optical axis is represented by G56, and T3,T4, T6, T7, G45 and G56 satisfy the inequality:(T3+T4+T6+T7)/(G45+G56)≤4.400.
 19. The optical imaging lens according toclaim 15, wherein a distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis is represented by G23, a thickness of the third lenselement along the optical axis is represented by T3, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34,a thickness of the seventh lens element along the optical axis isrepresented by T7, a distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis is represented by G78, and G23, T3, G34, T7 and G78satisfy the inequality:(G23+T3+G34+T7)/G78≤8.000.
 20. The optical imaging lens according toclaim 15, wherein a distance from the object-side surface of the firstlens element to an image plane along the optical axis is represented byTTL, a distance from the image-side surface of the fifth lens element tothe object-side surface of the sixth lens element along the optical axisis represented by G56, a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, and TTL, G56 andG78 satisfy the inequality:TTL/(G56+G78)≤10.000.